globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005280
Scopus记录号: 2-s2.0-84963620235
论文题名:
A mass budget for mercury and methylmercury in the Arctic Ocean
作者: Soerensen A; L; , Jacob D; J; , Schartup A; T; , Fisher J; A; , Lehnherr I; , St Louis V; L; , Heimbürger L; -E; , Sonke J; E; , Krabbenhoft D; P; , Sunderland E; M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期:4
起始页码: 560
结束页码: 575
语种: 英语
英文关键词: Arctic ; budget ; methylmercury ; model ; ocean
Scopus关键词: atmospheric deposition ; bioaccumulation ; chemical pollutant ; concentration (composition) ; freshwater input ; hydrological modeling ; ice cover ; mercury (element) ; methylmercury ; mixed layer ; sea ice ; seawater ; Arctic Ocean
英文摘要: Elevated biological concentrations of methylmercury (MeHg), a bioaccumulative neurotoxin, are observed throughout the Arctic Ocean, but major sources and degradation pathways in seawater are not well understood. We develop a mass budget for mercury species in the Arctic Ocean based on available data since 2004 and discuss implications and uncertainties. Our calculations show that high total mercury (Hg) in Arctic seawater relative to other basins reflect large freshwater inputs and sea ice cover that inhibits losses through evasion. We find that most net MeHg production (20 Mg a-1) occurs in the subsurface ocean (20-200 m). There it is converted to dimethylmercury (Me2Hg: 17 Mg a-1), which diffuses to the polar mixed layer and evades to the atmosphere (14 Mg a-1). Me2Hg has a short atmospheric lifetime and rapidly degrades back to MeHg. We postulate that most evaded Me2Hg is redeposited as MeHg and that atmospheric deposition is the largest net MeHg source (8 Mg a-1) to the biologically productive surface ocean. MeHg concentrations in Arctic Ocean seawater are elevated compared to lower latitudes. Riverine MeHg inputs account for approximately 15% of inputs to the surface ocean (2.5 Mg a-1) but greater importance in the future is likely given increasing freshwater discharges and permafrost melt. This may offset potential declines driven by increasing evasion from ice-free surface waters. Geochemical model simulations illustrate that for the most biologically relevant regions of the ocean, regulatory actions that decrease Hg inputs have the capacity to rapidly affect aquatic Hg concentrations. ©2016. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77861
Appears in Collections:气候变化事实与影响

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作者单位: Harvard T.H. Chan School of Public Health, Department of Environmental Health, Boston, MA, United States; Harvard University, John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA, United States; Stockholm University, Department of Environmental Science and Analytical Chemistry, Stockholm, Sweden; University of Wollongong, Centre for Atmospheric Chemistry, Wollongong, NSW, Australia; University of Alberta, Department of Biological Sciences, Edmonton, AB, Canada; University of Toronto-Mississauga, Department of Geography, Mississauga, ON, Canada; CNRS, Geoscience Environment Toulouse, Midi-Pyrenees Observatory, Toulouse, France; University of Bremen, Department of Geosciences, Bremen, Germany; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography UM 110, Marseille, France; U.S. Geological Survey, Middleton, WI, United States

Recommended Citation:
Soerensen A,L,, Jacob D,et al. A mass budget for mercury and methylmercury in the Arctic Ocean[J]. Global Biogeochemical Cycles,2016-01-01,30(4)
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